Abstract: By adding a voltage doubler and voltage inverter, a single 3V or 5V power supply can produce the voltages necessary to improve the performance on a dual voltage analog switch. With the higher power supplies and wider range, the on resistance and timing performance are enhanced. By adding a single component to a 3V-only or 5V-only board, you can operate conventional CMOS analog switches with performance approaching that specified with ±15V supplies. This means fast switching, low on-resistance, CMOS/TTL compatibility, low power consumption, and a signal range (±VCC) that exceeds the input supply range (VCC to ground). Simply add a charge-pump voltage converter (IC1), which produces ±2VCC outputs from a VCC input. These unregulated voltages ensure reliable switch operation for VCC levels as low as 3V. Logic thresholds for the switch remain unaffected. Figure 1. The charge pump (IC1) provides a local bipolar power supply for the CMOS analog switch (IC2). A VCC of 3V (for instance) produces ±6V rails for the switch (IC2), resulting in on-resistance <30Ω W, switching times <200ns, leakage <0.1nA, and ICC current <0.5mA. Raising VCC to 5V produces ±10V rails, resulting in on-resistance <20Ω W, switching times <150ns, leakage <0.4nA, and ICC current <1.3mA. IC1 can easily power additional switches and/or low-power op amps, but more than a few milliamps of load current degrades performance by lowering the unregulated supply rails. 我们期待您的反馈！ 喜欢？不喜欢？有待改善？或为我们提供建议？请与我们联系 — 我们将根据您的意见或建议改善我们的工作。 网页评价或提供建议 自动更新 需要自动接收最新发布的应用笔记吗？请订阅EE-Mail™ (English only)。 更多信息   APP 130: Jul 09, 1998 MAX319 精密的、SPST、CMOS模拟开关 完整的数据资料 (PDF, 144kB) 免费样品 MAX681 +5V至±10V电压变换器 完整的数据资料 (PDF, 85kB)   下载，PDF格式 (31kB)  AN130, AN 130, APP130, Appnote130, Appnote 130